Provided is a connector mountable on a board. The connector comprises a plurality of contacts, a housing holding the contacts, and a monitored member attached to the housing. The monitored member comprises a marker portion and an abutment portion brought into abutment with the board when the connector is mounted on the board in a vertical direction. The abutment portion is apart from the marker portion by a predetermined distance in the vertical direction. The height of the housing is indirectly measured by investigating a position of the marker portion.